<template>
  <div class="login">
     <div class="login-fixed">
       <img class="logo" src="../assets/logo.png" />
       <el-form ref="loginFormRef" :model="loginForm" :rules="formrules" label-width="0" >
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="el-icon-s-goods" show-password></el-input>
        </el-form-item> 
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm('loginFormRef')">重置</el-button>
        </el-form-item>
       </el-form>
     </div>
  </div>
</template>

<script>
export default {
  name: 'login',
  data () {
    return {
      loginForm:{
        username:"admin",
        password:"123456"
      },
      formrules:{
        username:[
            { required: true, message: '请输入用户名', trigger: 'blur' },
            { min: 3, max: 15, message: '长度在 3 到 15 个字符', trigger: 'blur' }         
        ],
        password:[
            { required: true, message: '请输入密码', trigger: 'blur' },
            { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }            
        ]
      } 
	  
	  
    }
  },
  methods: {
    resetLoginForm(e) {
      this.$refs[e].resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功')
        // 1. 将登录成功之后的 token，保存到客户端的 sessionStorage 中
        //   1.1 项目中出了登录之外的其他API接口，必须在登录之后才能访问
        //   1.2 token 只应在当前网站打开期间生效，所以将 token 保存在 sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)
        // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style scoped>
.login{
  background: #303133;
  height: 100%;
}
.login-fixed{
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  width:400px;
  height: 230px;
  background: #fff;
  border-radius: 10px;
  padding: 120px 30px 0;
}
.logo{
  position: fixed;
  top: 0;
  left: 50%;
  transform: translate(-50%,-50%);
  width:150px;
  height: 150px;
  padding: 10px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, .12), 0 0 6px rgba(0, 0, 0, .04)
}
.btns{
  display: flex;
  justify-content: center;
}
</style>
